SOLUTION: x-4y+2=0

Question 932333: x-4y+2=0
Found 2 solutions by Alan3354, emanAZ:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Do you have a question?
Answer by emanAZ(2) (Show Source): You can put this solution on YOUR website!
can u help me to solve these three questions?
1. The salary of workers x in a certain company is approximately normally distributed with a mean of $ 2500 and a standard deviation of $ 50. The company would like to claim that 80 % of workers got salary within $c. Find the value of c that makes this statement true?
2. The amount of rainfall x in a certain country in summer is approximately normally distributed with a mean of 3.8 ml and a standard deviation of 1.05, The members of weather forecast would like to claim that 86.5 % chance of rainfall is within c ml. Find the value of c that makes this statement true?

3. The grade Y in a certain subject is approximately normally distributed with a mean of 16 and a standard deviation of 5.71. The teacher would like to claim that 90.5 % of students got within Y marks. Find the value of Y that makes this statement true?

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